Piston packing



May a. 1927. mzww J. F'. PANYARD PISTON PACKING Filed Auz. 28, 1925 ATTORNEY:

Patent JOHN. F. PAN'YARD, OI DETROIT, MICHIGAN.

PISTON PACKING.

. Application flledAug'ist 28, 1925. Serial No. 53,019.

My invention relates to improvements in piston packing. This applicationis a continuation in partof application Serial No. 629,994, filed April5, 1923.

The object of my invention is to provide a piston packing comprising aplurality of ring sections independently stabilized with in the grooveand so constructed and arranged that rotation of one section relative tothe other wedges the packing against the side walls of the groove andholds it against the cylinder Wall. An advantage of packing of this typeis that a close joint is maintained with the side walls of the groovewithout the exertion of excessive pressure against the wall ofthecylinder.

An important advantage of my inve tion resides in the employment inpacking of the character described of a pair of co-operating splitexpansible ring sections, each of substantially the width of the groove,one section being located within the other so that the outer sectionalone engages the cylinder wall, which sections have helical meetingfaces whereby upon relative rotation they are wedged against the sidewalls of the groove, together with means engaging one section to urge itrotatably counter the helical face of its co-operating section.

A valuable feature consists in the use of a spring wound upon itselfabout the piston in the bottom of the groove engaging one ring sectionto urge the same rotatably to wedge the packing against the side wallsof the groove, which spring is anchored to the piston by having one endspread outwardly to be wedged within the groove to secure the ringtherein. The end of the s ring may be spread apart to anchor it to t egroove in a number of different ways, as

. illustrated in the drawing. f 6

Other objects and meritorious features will more fully appear from thefollowing description, appended claims" and accompanying drawings, inwhich:

Figure l is a horizontal sectional view throu h a piston provided withmy improv packlng.

Fig. 2 is a slde elevation of my lmproved packing rings separated fromeach other.

Fig. 3 is a fragmentary sectional view through a piston showing therings seated within the groove. y

Fig. 4 is a side elevation of the spring.

Figs. 5 to 9 inclusive show fragmentary end elevations of modified formsof springs expansible co-operating the groove of the piston as 16. Ringsection 14 is section 16. Each ring section is expanded the width of thegroove in the piston. Ring section 14 is the groove. Ring section 16superim oses ring section 14 and engages the cylinder wall 18. The tworing cal meeting faces 20. As each ring tion is approximately the widthof the groove they are independentl stabilized within the groove and asrotata le pressure seated within the bottom of I sections have heli- 79is exerted upon one ring section counter the other. the two ringsections are wedged against the side walls of the groove.

I have shown min section 16 as anchored against rotation wit 1n thegroove by means or a pin 22. Ring section 14 is held under 30 I,

rotatable pressure counter the stationary helical face 20 of ringsection 16 through the employment of a spring 24 which is turned up atone end as at 26 into the split of ring section 14, engaging the tatableimpulse thereon, and is anchored at same to exert a lo the opposite endin the bottom of the groove to the piston.

Various means may be employed to anchor the spring and piston and I havehere shown in Figs. 5 to 9 inclusive different methods of spreading theend of the spring after it has been positioned in the groove so as toWedge such end tightly within the n Fig. 5 I have shown the spring asformed at' the end on a radius, the concaved side of which is placedagainst the bottom of the groove and the end of the spring is spread byhitting the convex side with a hammer to a flat spring the end and arespread apart. in the groove.

In Fig. 8, I have shown a s ring which is slitted adjacent to the endand groove to anchor the spring to the piston. 95

spread apart section approximately the width ,of the groove seated inthe bottom thereof, a sec- 1 nd ring section of approximately the width'helical meet ng faces of the groove seated therein superimposing thefirst ring section, said sections having whereby rotation of one section111 a given direction wedges the i combined packing axially against theside walls of the groove, means against the anchored engaging one ofexert rotatable pressure the sections axially withln said sections tothereon to wedge the groove, within said groove as to resist rotationtherein. Y

2. In piston packing, a piston having a groove for packing, packing insaid groove comprising a split expansible ring section approximately thewidth of the groove and seated in the'bottomthereof, a second splitexpansible ring section approximately the Width of the groove seatedtherein superimposin the first ring sedtion, one of said sections einanchored to the piston, the other section being rotatable within thegroove, and a spring engaging the rotatable ring sec tion to exertrotatable pressure thereon counter the helical race of the anchored ringsection.

3. In piston packing, a piston having a groove for packing, packin insaid groove comprising a split expansi ble ring section approximatelythe width of the groove rotatably disposed in therbottom thereof, asplit expansible ring section approximately the width of the grooveanchored therein completely superimposing the first ring section, saidring sections having helical lateral meeting faces, a spring anchored tothe piston and wound thereabout in the bottom of the groove engaging thefirst ring section to urge the same rotatably to wedge it ring section.

4. In piston packing, a piston having a groove for packing, packing insaid groove comprising a pair of ring sections having helical meetingfaces whereby upon rotation of one section relative to the other counterthe helical faces the axial diameter of the combined packing isincreased and the ring sections are wedged against the side walls of thegroove in the piston, engaging one of said ring sections to exertrotatable pressure thereon,

said other section so mountedv at one end within the and a spring saidspring an- I H: W

chored to the iston by having a portion spread dutward ly within thegroove to be wedged in place therein, said other section so mountedwithin the groove as to resist rotation therein.

5. In piston packing, a piston having a groove for packing, packing insaid groove comprising a rotatable ring section having a helical lateralface, said groove provided with a helical. lateral meeting face wherebyuponrotation of the ring section counter the helical; face of the groovethe ring is wedged thereag ainst, and a spring anchored to the piston,being spread within the groove against the side wal s thereof andengaged .to the rin to exert rotatable pressure thereonto we go the sameaxially against a side wall of the groove.

6. In piston packing, a piston having a groove for packing, packing insaid oove comprising a ring section aving a elical face, said grooveprovided with a cooperating meeting helical face, said section ada edupon its rotation to be wedged axial within the groove, and a spring sread apart groove to e anchored to the piston, said sprmg engaged withthe ring section to urge t e same rotatably within the groove.

7 In piston pIacking groove for pac ing, the packing in said groovecomprising a split expansible ring section approximately the width ofthe groove rotatably disposed within the bottom of the groove, sectionapproximately the width of the groove anchored therein superimposing thefirst ring section, said ring sections having helical meeting shoulderswhereby rotation a piston having a of the first ring section in a givendirection wedges the ring sections against the side walls of the groove,and a spring wound about the piston in the bottom of the groove andanchored thereto by being spread apart at one end to be wedged withinthe groove and engaged at the opposite end to the first ring section toexert rotatable pressure thereon counter the helical face of the secondring section.

8. In piston packing, a piston havin a groove for packing, a ringsection rotataIily isposed therein, said groove and ring sectionprovided adapted upon rotation of the ring within the groove in a givendirection to wedge the ring axially within the groove, a sprin anchoredwithin the groove by being spread apart to be wedged therein and engagedwith with meeting helical faces a second split expansible ring the ringsection. to exert rotatable pressure tion; JOHN F. PAN YARD.

